They’re a private company, they can choose whether or not they want to allow individual persons or organizations to use their platform. They have that right.
They’re not just any private company though, they’re a major mass communication company and they’re basically making, what I believe amount to, illegal campaign donations to the democrat party via the suppression of of their primary political opponent.
They are part of a Cartel, which has been illegal in this country since the era of Teddy Roosevelt
That makes them a publisher then, and fbook is a publicly traded company.
What if there is a Quid pro quo? Censorship by proxy for the Government in exchange for special favors?